drm: Set vm_ops to GEM object's values during mmap

The GEM mmap code relies on the GEM object's mmap callback to set the
VMA's vm_ops field. This is easily forgotten and already led to a memory
leak in the CMA helpers. Instead set the vm_ops field in the DRM core
code to the GEM object's value. Drivers with different needs can override
this in their mmap callback.

v2:
	* support (vm_ops == NULL) if mmap is given; required by VRAM
	  helpers

Signed-off-by: Thomas Zimmermann <[email protected]>
Fixes: f5ca8eb6f9bd ("drm/cma-helper: Implement mmap as GEM CMA object functions")
Reviewed-by: Daniel Vetter <[email protected]>
Reported-by: Kieran Bingham <[email protected]>
Tested-by: Kieran Bingham <[email protected]>
Cc: Maxime Ripard <[email protected]>
Cc: Maarten Lankhorst <[email protected]>
Cc: David Airlie <[email protected]>
Cc: Daniel Vetter <[email protected]>
Cc: Eric Anholt <[email protected]>
Cc: [email protected]
Link: https://patchwork.freedesktop.org/patch/msgid/[email protected]

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